842E-CM-MIP1BA罗克韦尔

842E-CM-MIP1BA 842E-CM-MIP1BA

现货供应  价格优势

陕西欣鸿然自动化设备有限公司

联系人:宁超 热线：029-83338136

手机：15339052544 Q Q:1293858601

邮箱:1293858601@qq.com 传真:029-83561013

主营产品：AB全线产品，西门子全线产品，ABB定位器

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固态开关，也称为无触点开关，一般由电力电子技术实现，

其国际标准命名为：半导体交流电力控制器(Semiconductor AC Power Controller)， 无触点开关与机械式有触点开关比较有以下优点：(1)寿命长，机械式分断时起弧、触头磨损，固态开关没有磨损。(2)工作频率高，机械式为4~10工频周波，固态开关<10ms。(3)可靠性高。(4)使用安全。(5)电磁干扰小。其比较如右图所示。

固态开关的缺点有： (1)发热;需冷却器或短路开关。(2)抑制瞬变;需吸收网络，不全断开。(3)无明显断点。

(1)半控型固态开关：对于关断时间要求不甚高的场合(10ms以上)，同时需要考虑经济性时，可选用半控型固态开关。

(2)全控型固态开关：重要负荷，容量大，而且对电能质量的要求越来越高场合,需要研究具有更优越性能的全控型固态开关技术，以满足用户的要求。

(1)移相控制：控制晶闸管在正、负半波中对称触发控制。以导通角θ的大小来调节输出电压大小。 还可以根据反馈量的类别分为电压控制、电流控制、功率控制或其它物理量的控制。

(2)过零控制：以一个设定的时间为周期，以过零触发方式控制晶闸管在设定周期中的导通周波数。从而确定输出功率的大小。在带有变压器负载时，不能随机半波控制，即使全波控制过零触发也要保证始终正向(或负向)关断--防止单向磁偏。还会带来间谐波。

(3)开关控制：通过晶闸管对交流负载进行通断控制，具体还可以分为：任意接通模式--开通延时很小，为微秒级;过零接通模式--开通延时比较大10ms，关断延时比较大也可达10ms。交流电子开关的控制输入信号仍为开关量(1或0)。

固态开关的应用编辑(1)软启动、软关断直流固态开关;

(2)具有短路限流保护的固态开关;

(3)负载自动切换开关(LTM);

(4)固态开关在单相电机起动中的应用。

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